CN105164588A - Image formation device - Google Patents
Image formation device Download PDFInfo
- Publication number
- CN105164588A CN105164588A CN201480021638.1A CN201480021638A CN105164588A CN 105164588 A CN105164588 A CN 105164588A CN 201480021638 A CN201480021638 A CN 201480021638A CN 105164588 A CN105164588 A CN 105164588A
- Authority
- CN
- China
- Prior art keywords
- pixel
- data
- object pixel
- photosensitive
- correction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light
- B41J2/471—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
- G02B26/127—Adaptive control of the scanning light beam, e.g. using the feedback from one or more detectors
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/04036—Details of illuminating systems, e.g. lamps, reflectors
- G03G15/04045—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers
- G03G15/04072—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers by laser
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Control Or Security For Electrophotography (AREA)
- Facsimile Scanning Arrangements (AREA)
- Laser Beam Printer (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Mechanical Optical Scanning Systems (AREA)
Abstract
Since the angle of incidence of laser light on a photoreceptor differs by exposure position in a primary scanning direction, the shape of the spot said laser light forms on the photoreceptor differs in the primary scanning direction. Filter coefficients are varied in the primary scanning direction and used to correct image data.
Description
Technical field
The present invention relates to the electro photography image forming apparatus of such as digital copier, multifunctional equipment or laser printer.
Background technology
Electro photography image forming apparatus is by being developed in electrostatic latent image that photosensitive-member is formed and forming image with toner.Image forming apparatus comprises optical scanner.By scanning based on the view data laser launched from optical scanner, photosensitive-member forms electrostatic latent image.Optical scanner comprise the laser that deflection is launched from light source turnable multi-arris mirror and by the laser aiming that deflected by the turnable multi-arris mirror optics to the such as lens or mirror photosensitive-member.
The sensitometric characteristic on the surface of photosensitive-member changes slightly according to the position on the surface of photosensitive-member.Even if photosensitive-member is exposed to the laser of identical light quantity, due to the unevenness of the sensitometric characteristic on the surface of photosensitive-member, the concentration of output image also may be uneven.
In order to solve this problem, PTL1 discloses a kind of image forming apparatus carrying out image correcting data according to the scanning position of laser on photosensitive-member (exposure position).By the image forming apparatus described in PTL1, the unevenness of the output image density that the unevenness that can limit the sensitometric characteristic on the surface due to photosensitive-member causes.
Quoted passage list
Patent documentation
Japanese Patent Publication No.2010-131989
Summary of the invention
Technical matters
But except above-mentioned problem, electro photography image forming apparatus also has problem.As shown in figure 21, laser is different relative to the exposure position on the direction (main scanning direction) of the laser scanning photosensitive-member of incident angle according to Figure 21 (a) of photosensitive-member.Given this, the spot shape of laser on photosensitive-member is different according to the position on main scanning direction.In addition, the spot shape of laser on photosensitive-member may according to uneven on main scanning direction to the photosensitive-member guiding lens of laser or the layout precision of mirror.Due to the unevenness of the spot shape of the laser on main scanning direction, may be difficult to obtain good image.Especially, with the screen angle tilted to main scanning direction (such as, as shown in-45 ° of+45 ° of the L2 in Figure 21 (c) and R2) when forming image, due to different orientation and the different screen angles of the spot shape of laser, the picture quality of output image may reduce.
The solution of problem
In view of the above-mentioned problems, propose the present invention, provide a kind of image forming apparatus, this image forming apparatus comprises: light source, is configured to launch the light beam for being exposed by photosensitive-member; Inflector assembly, makes beam flying photosensitive-member for deflected beam; Optical devices, for being directed to photosensitive-member by the light beam deflected by inflector assembly; Data generating apparatus, for generation of the pixel data corresponding with each pixel comprised in the output image; Output unit, for exporting for correcting by making photosensitive-member be exposed to light beam and the correction data of the unevenness of the Potential Distributing of the electrostatic latent image centered by object pixel formed on photosensitive-member along the direction of scanning of beam flying photosensitive-member, described correction data is corresponding with the position of the object pixel on direction of scanning, and output unit exports the correction data of instruction owing to making the surrounding pixel be positioned at around object pixel be exposed to the potential change amount of the position of the object pixel that light beam causes; Means for correcting, for the pixel data of the pixel data correction target pixel based on correction data and object pixel; And control device, for controlling light source to form object pixel based on the pixel data of the object pixel by correction.In addition, provide another kind of image forming apparatus, this image forming apparatus comprises: light source, is configured to launch the light beam for being exposed by photosensitive-member; Inflector assembly, makes beam flying photosensitive-member for deflected beam; Optical devices, for being directed to photosensitive-member by the light beam deflected by inflector assembly; Data generating apparatus, for generation of the pixel data corresponding with each pixel comprised in the output image; Output unit, for exporting the correction data of the unevenness of the Potential Distributing for correcting the electrostatic latent image centered by object pixel formed on photosensitive-member by making photosensitive-member be exposed to light beam along the direction of scanning of beam flying photosensitive-member, the potential change amount of the pixel position of the surrounding pixel around the object pixel that described correction data instruction causes due to the exposure of object pixel; Means for correcting, for the pixel data of correction target pixel and the pixel data of object pixel that corrects based on correction data; And control device, for controlling light source to form object pixel based on the pixel data by correction.
Advantageous effects of the present invention
By the present invention, by using two dimensional filter image correcting data, limit the reduction of the picture quality that the unevenness due to the spot shape of the laser on main scanning direction causes.
Accompanying drawing explanation
[Fig. 1] Fig. 1 is the schematic sectional view of image forming apparatus.
[Fig. 2] Fig. 2 is the schematic configuration diagram of optical scanner.
[Fig. 3] Fig. 3 is the control block diagram be contained according to the image processor in the image forming apparatus of the first embodiment and laser driver.
[Fig. 4] Fig. 4 is the block diagram of exposure modulator.
[Fig. 5] Fig. 5 provides the key diagram of LUT.
[Fig. 6] Fig. 6 illustrates the Fourier transform results of dimensional Gaussian distribution plan and dimensional Gaussian distribution.
[Fig. 7] Fig. 7 illustrates exposure distribution performance data.
[Fig. 8] Fig. 8 illustrates the differential data between exposure distribution performance data and datum characteristic data.
[Fig. 9] Fig. 9 is the correction data produced based on differential data.
[Figure 10] Figure 10 is the schematic diagram of filter coefficient.
[Figure 11] Figure 11 is the matrix diagram of filter coefficient.
[Figure 12] Figure 12 illustrates the effect provided by two dimensional filter.
[Figure 13] Figure 13 providing package is contained in the control block diagram according to the image processor in the image forming apparatus of the second embodiment.
[Figure 14] Figure 14 is the matrix diagram of filter coefficient.
[Figure 15] Figure 15 is the concept map of the first computing.
[Figure 16] Figure 16 illustrates the example be stored according to the filter coefficient in the ROM of the image forming apparatus of the second embodiment.
[Figure 17] Figure 17 is the concept map of the second computing.
[Figure 18] Figure 18 illustrates the change according to the spot shape defocused.
[Figure 19] Figure 19 is contained in the control block diagram according to the image processor in the image forming apparatus of the 3rd embodiment.
[Figure 20] Figure 20 is according to the control flow performed in the image forming apparatus of the 3rd embodiment.
[Figure 21] Figure 21 illustrates the exposure distribution in the photosensitive drums in the image forming apparatus of prior art.
Embodiment
First embodiment
The embodiment of electro photography color image forming as an example is below described.It should be noted that embodiment is not limited to color image forming, and can be monochrome image forming device.
Fig. 1 is the schematic sectional view of color image forming.Color image forming shown in Fig. 1 comprises reading device 22.Reading device 22 comprises ADF18 (auto document feeder), original copy plate 19, catoptron group 20 and imageing sensor 21.The original copy being located at pre-position is transferred to original copy plate 19 by ADF18.Reading device 22 comprises lighting device (not shown).Lighting device is used up and is irradiated the original copy being transferred to original copy plate 19 from ADF18 or the original copy be placed on original copy plate 19.Imageing sensor 21 is drawn towards by catoptron group 20 from the light of original copy reflection.Imageing sensor 21 comprises the CCD as photo-electric conversion element.CCD produces reads image data by receiving reflected light.
Two boxlike paper feedthrough part 1 and 2 and single manual paper feedthrough part 3 is comprised according to the image forming apparatus of the present embodiment.Optionally recording sheet S (recording medium) is fed to from paper feedthrough part 1,2 and 3.Recording sheet S is laminated in box 4 or 5, or is laminated on the manual feed tray 6 of paper feedthrough part 1,2 or 3.Recording sheet S is picked up successively by the pick-up roller 7 being arranged on each place in each paper feedthrough part.Then, in the recording sheet S picked up by pick-up roller 7, the recording sheet S at the top place of a pile recording sheet is sent to alignment roller to 12 by the separate roller comprising feed roller 8A and delay roller 8B to 8.In this case, from be arranged to alignment roller to the 12 recording sheet S with the box 4 and 5 of large distance one feeding by multiple delivery roll to 9,10 and 11 by transfer, be then sent to alignment roller to 12.
When be sent to alignment roller to the recording sheet S of 12 before end in contact alignment roller to 12 nip portion and form predetermined loop (loop) time, the movement of recording sheet S temporarily stops.By forming this loop, the diagonal state of recording sheet S is corrected.
Intermediate transfer belt (endless belt) 13 as the length of intermediate transfer element be arranged in alignment roller to 12 downstream.Intermediate transfer belt 13 by tension force around driven roller 13a, the second transfer printing opposed roller 13b and jockey pulley 13c, to have general triangular shape in the sectional views.Intermediate transfer belt 13 rotates clockwise in the drawings.Multiple photosensitive drums 14,15,16 and 17 is arranged on the upper surface of the horizontal component of intermediate transfer belt 13 along the sense of rotation of intermediate transfer belt 13.Photosensitive drums 14,15,16 and 17 is the photosensitive-members of the toner image carrying different colours respectively.
The photosensitive drums 14 of the side, most upstream of intermediate transfer belt sense of rotation carries the toner image of magenta, next photosensitive drums 15 carries the toner image of cyan, next photosensitive drums 16 carries yellow toner image, and the photosensitive drums 17 of most downstream side carries the toner image of black.
Reference numeral LM, LC, LY, LB represent respectively with photosensitive drums 14,15,16 and 17 corresponding optical scanners (laser scanner).
Below, Description Image forming process.The photosensitive drums 14 of most upstream is exposed to laser LM based on the view data of magenta composition.When laser LM scans photosensitive drums 14, photosensitive drums 14 forms electrostatic latent image.This electrostatic latent image is developed by the toner of the magenta supplied from developing cell 23.
Photosensitive drums 15 is exposed to laser LC based on the view data of cyan component.When photosensitive drums 15 is exposed to laser LC, photosensitive drums 15 forms electrostatic latent image.This electrostatic latent image is developed by the toner of the cyan supplied from developing cell 24.
Photosensitive drums 16 is exposed to laser LY based on the view data of yellow component.When photosensitive drums 16 is exposed to laser LY, photosensitive drums 16 forms electrostatic latent image.This electrostatic latent image is developed by the toner of the yellow supplied from developing cell 25.
Photosensitive drums 17 is exposed to laser LB based on the view data of black content.When photosensitive drums 17 is exposed to laser LB, photosensitive drums 17 forms electrostatic latent image.This electrostatic latent image is developed by the toner of the black supplied from developing cell 26.
For making the first charged elements 27 ~ 30 of each photosensitive drums 14 ~ 17 uniform charged, for removing the clearer 31 ~ 34 that is attached to the toner in photosensitive drums 14 ~ 17 after transfer printing toner image and other parts are arranged in around each photosensitive drums 14 ~ 17.
Toner image in photosensitive drums is through the transfer section intermediate transfer belt 13 and photosensitive drums 14 ~ 17.Toner image in each photosensitive drums is needed on intermediate transfer belt 13 by the transfer bias applied by transfer belt electric unit 90 ~ 93.
Then, the timing that alignment roller is aimed at the front end of recording sheet about the toner image on intermediate transfer belt 13 12 starts to rotate.Recording sheet S to be transferred to the second transfer section T2 between the second transfer roll 40 and the second transfer printing opposed roller 13b to 12 by alignment roller.At the second transfer section T2 place, the toner image on intermediate transfer belt 13 is needed on recording sheet S by the transfer bias being applied to the second transfer roll 40.
Recording sheet S through the second transfer section T2 is sent to fixing device 35 by intermediate transfer belt 13.Then, pass at recording sheet S in the process of the compressed portion formed by the fixing roller 35A in fixing device 35 and backer roll 35B, toner image on recording sheet S is heated by fixing roller 35A, pressurized by backer roll 35B, and thus fixing in recording sheet on the surface.Recording sheet S is through fixing device 35 and the recording sheet S be applied in after fixing process is sent to distributing roller to 37 by delivery roll to 36, and is discharged in the discharge tray 38 be arranged in outside device further.
Fig. 2 is the schematic configuration diagram of one of optical scanner 101,102,103 and 104.Each optical scanner has identical configuration, and thus, Fig. 2 exemplarily illustrates optical scanner 101.In fig. 2, the divergencing laser launched from lasing light emitter 300 turns to almost parallel light by collimation lens 301 collimation, and the throughput of laser is limited by aperture 302.Therefore, laser is shaped.Laser through aperture 302 is incident on beam splitter 308.Laser through aperture 302 is divided into the laser being incident in photodiode 309 (hereinafter referred to as PD309) and the laser of guiding turnable multi-arris mirror 305 (hereinafter referred to as polygon prism 305) into by beam splitter 308.PD309 is in response to the detection signal of the reception output of the laser value corresponding with the light quantity of laser.Laser driver 310 performs FEEDBACK CONTROL according to the detection signal from PD309 to the light quantity of laser.By the LED control signal 318 from CPU212 (describing below), laser driver 310 is luminous by control.
Laser through beam splitter 308 passes cylindrical lens 303 and is incident on polygon prism 305.Polygon prism 303 has multiple reflecting surface.Polygon prism 305 rotates along arrow A direction when being driven by motor 304.Polygon prism 305 deflects the laser be incident on reflecting surface, makes laser along arrow B scanning direction photosensitive drums 14.The laser light deflected by polygon prism 305 has the imaging optical system (f θ lens) 306 of f θ characteristic, and is introduced in photosensitive drums 14 by mirror 307.
Optical scanner 101 comprises the beam detector 312 (hereinafter referred to as BD312) as synchronization signal generation apparatus.Position outside image forming area in photosensitive drums 14, BD312 is arranged in the scanning pattern of laser.BD312 produces horizontal-drive signal 317 when receiving the laser deflected by polygon prism 305.Horizontal-drive signal 317 is imported into CPU212.CPU212 transmits signal for faster as the control signal 316 in Fig. 2 or reduce-speed sign to motor driver 313, horizontal-drive signal 317 is made to meet the benchmark period corresponding with the target velocity of polygon prism 305, further, predetermined phase relation is become relative to the phase relation of the polygon prism be contained in other optical scanner.Motor driver 313 is accelerated the rotational speed of motor 304 based on signal for faster and based on reduce-speed sign, motor 304 is slowed down.
In addition, CPU212 according to horizontal-drive signal 307 control based on the laser of the view data carrying out self-excitation light source 300 transmitting timing.CPU212 comprise to reset in response to the input of horizontal-drive signal 307 its counting and from reset mode the counter (not shown) of counting clock signal (describing below).CPU212 controls image processor (describing) and laser driver 310 below based on the count value of counter.
Fig. 3 illustrates the block diagram be contained according to the image processor in the image forming apparatus of the present embodiment and laser driver 310.Image processor shown in Fig. 3 comprises the clock generator 506 of clocking.Each frame (describing below) performs each process with clock signal synchronization ground.Clock signal is the signal that frequency is higher than the frequency of horizontal-drive signal.Reading images processor 501 receives reads image data from imageing sensor 21, and the signal of reception is converted to the view data of answering with each Color pair.In addition, reading images processor 501 performs conversion process reads image data being converted to the pixel data corresponding with output image and the picture process (screenprocessing) of answering with each Color pair.
Controller 502 writes the view data processed by reading images processor 501 in storer 505, reads the view data of write, and view data is input to exposure modulator 503.Exposure modulator 503 processes the view data (describing details below) inputted from controller 502, and the view data of process is outputted to pattern transfer device 508.Pattern transfer device 508 converts the view data processed by exposure modulator 503 to bit patterns as binary data.Bit patterns is outputted to parallel/serial converter 504 (concurrently carry-out bit data) with clock signal synchronization ground by pattern transfer device 508.Clock generator 506 is by the multiplied clock signal of double with phaselocked loop 507 (PLL507) (multiply) synchronously Serial output bit data and produce pwm signal.Lasing light emitter 303 controls as luminous or not luminous according to pwm signal by laser driver 310.
Now, the exposure intensity distribution of the laser in photosensitive drums is described.Fig. 6 (a) illustrates that the exposure intensity distribution centered by object pixel is (following, referred to as exposure distribution), this object pixel is the single pixel be exposed when being exposed on the surface of photosensitive drums with the light quantity corresponding with single pixel by scanning laser on the surface of photosensitive drums.In Fig. 6 (a), transverse axis represents pixel quantity, and the longitudinal axis represents exposure.Fig. 6 (a) illustrates the One-Dimensional Extended of exposure distribution.Centre coordinate 0 corresponds to object pixel.But according to the design of optical system, exposure distribution has the trend of roughly dimensional Gaussian distribution, as shown in Fig. 6 (a).Further, found that such as in the system of resolution with 2400dpi by simulation and experiment, the expansion of the exposure distribution centered by object pixel is the expansion extending to tens pixels be positioned at around object pixel.
The expansion that can obtain spot on the impact of picture frequency as by performing the characteristic that Fourier transform obtains to spread function.Fig. 6 (b) illustrates the characteristic obtained by the Fourier transform of the waveform in Fig. 6 (a).The characteristic that Fig. 6 (b) changes when illustrating that the distance between pixel is assumed that 0.1.Transverse axis representation space frequency, the longitudinal axis represents intensity.
On the contrary, in the prior art, in order to reduce the impact on surrounding pixel, by image procossing, such as, image procossing by providing such as high scope to strengthen in advance, provides correction.Such as, the nonlinear characteristic of the rising of such as exposure, sub-image electromotive force and laser etc. is converted by LUT1 and LUT2, and by using fixing filter factor to utilize two dimensional filter to be corrected.
But, due to the increase of the resolution of output image, the exposure range impact pixel around of single pixel, and the shape of the exposure spot of the position on main scanning direction is uneven.Thus, the two dimensional filter of prior art can not provide sufficient correction.
In order to solve such problem, pass through to use correcting filter (correction parameter) image correcting data in the exposure modulator 503 shown in Fig. 3 according to the image forming apparatus of the present embodiment, to limit the unevenness of exposure intensity distribution (Potential Distributing of electrostatic latent image) of the position on main scanning direction.Exposure modulator 503 is by using the gray scale of LUT2001 (look-up table 2001) correcting image, by using two dimensional filter to perform process, and by using LUT2003 (look-up table 2003) to correct the linear of the output of the laser caused by the transient characteristic of the equipment energy characteristic as laser driver 310 and lasing light emitter 300.
Now, the linear of the output of the laser caused by transient characteristic is described.Fig. 5 (a) illustrates the input/output signal of laser driver 310.Horizontal axis representing time, the longitudinal axis represents signal voltage.Fig. 5 (a) illustrates the output waveform of the laser of the input of the pwm signal for duty=15%, the output waveform for the laser of the input of the output waveform of the laser of the input of the pwm signal of duty=50% and the pwm signal of duty=85%.In addition, Reference numeral T15, T50 and T85 in Fig. 5 (a) represent that the pulse of pwm signal is the high period.Reference numeral T15 ', T50 ' and T85 ' represent the width of the output waveform of the laser of the input of the pwm signal for the pulse in T15, T50 and T85.It should be noted that duty is represented as the ratio of high period and the period of PWM.
As shown in Fig. 5 (a), if the pwm signal of duty=15% is imported into laser driver 310, so, due to the transient characteristic of laser driver 310 and lasing light emitter, pwm signal becomes low, and the output waveform of laser becomes height, thus, the output waveform of laser pulse narrowing and become and be equivalent to dotted line waveform (T15>T15 ').If the pwm signal of duty=85% is imported into laser driver 310, so pwm signal becomes height, and the output waveform of laser becomes low, the time width of low period narrows and becomes and is equivalent to dotted line waveform (T85<T85 ').When duty=50%, even if there is transient characteristic, pulse width is constant (T50=T50 ') also.By this way, the input of pwm signal is not proportional with the duty of the output waveform of laser.
The left figure of Fig. 5 (b) is the diagram of the relation of drawing continuously between the input of pwm signal and the output of laser.The longitudinal axis in the left figure of Fig. 5 (b) illustrates the input pulse width of the pwm signal shown in Fig. 5 (a), and the longitudinal axis is the pulse width of the output waveform of laser.As shown in the left figure of Fig. 5 (b), the relation between the pulse width of the input pulse width of pwm signal and the output waveform of laser is not linear.If the relation between the pulse width of the output waveform of the input pulse width of pwm signal and laser is not linear, so linear reduction of image color.
Therefore, the present embodiment image forming apparatus by be used as in LUT2003 the correction parameter of the inverse characteristic of the left figure with Fig. 5 (b), LUT (look-up table) in the right figure of Fig. 5 (b) carrys out image correcting data and guarantees the linear of the output of laser.
Below, the correction using two dimensional filter 2002 in exposure modulator 503 is described in reference to Fig. 4 and Fig. 7 ~ 11.Fig. 4, Figure 10 and Figure 11 illustrate the inside configuration of exposure modulator 503, the inside configuration of the object pixel of two dimensional filter 2002 and the filter factor (correction parameter) of surrounding pixel and two dimensional filter 2002 respectively.
As shown in Figure 4, the view data being corrected gray scale by LUT2001 is imported into two dimensional filter.Two dimensional filter 2002 by use respectively to object pixel k (0,0) and be positioned at center object pixel around the filter factor that distributes of surrounding pixel k (m, n) carry out the view data of correction target pixel.Figure 10 is 15 × 15 filter factor matrixes of the filter factor representing object pixel k (0,0) and surrounding pixel k (m, n).
Filter factor corresponding with object pixel and surrounding pixel is respectively produced as follows according to the image forming apparatus of the present embodiment.Exposure modulator 503 comprises main sweep counter 2005, main sweep variance profile (profile) storer 2006, subscan variance contours memory 2007, master/slave covariance contours memory 2008 and filter factor generator 2004.
By the variance yields that the configuration of the optical system and equipment that comprise lens, mirror and polygon prism by optical scanner is determined, determine the exposure distribution of the laser in the photosensitive drums in the image forming apparatus of the present embodiment.Specifically, the optical system of lens, mirror and polygon prism and the configuration of equipment is comprised according to optical scanner, main scanning direction is (following, be called x direction) variance yields σ x (first party difference), the variance yields σ y (second party difference) of sub scanning direction (hereinafter referred to as y direction) and the covariance value ρ xy (third party's difference) in x direction and y direction determined.The exposure distribution of the laser in photosensitive drums is determined by following formula:
[mathematical expression 1]
Variance yields σ x and σ y and covariance value ρ xy is the value of the exposure distribution centered by the object pixel of instruction in photosensitive drums, and this value changes according to the position x of main scanning direction.Thus, when assembling in the factory and adjusting image forming apparatus, by measuring each variance yields in the position of main scanning direction, produce variance profile σ x (x), σ y (x) and ρ xy (x).Main sweep variance profile σ x (x) as the profile of the variance yields σ x of main scanning direction is stored in main sweep variance contours memory 2006.Subscan variance profile σ y (x) as the profile of the variance yields σ y of sub scanning direction is stored in subscan variance contours memory 2007.Covariance value profile ρ xy (x) as the profile of the covariance value ρ xy corresponding with main scanning direction and sub scanning direction is stored in master/slave covariance contours memory 2008.
Main sweep counter 2005 resets when receiving the input of horizontal-drive signal 317, and the pulse of counting clock signal from reset mode.The count value of main sweep counter 2005 is values of the position x of instruction main scanning direction.Scanning variance contours memory 2006, subscan variance contours memory 2007 and master/slave covariance contours memory 2008 export the variance yields corresponding with the count value of main sweep counter 2005 respectively to the data producer 2015 of filter factor generator 2004.
Filter factor generator 2004 comprises data producer 2015, Two-dimensional FFT 2013, ROM2014, arithmetic element 2011, correcting range designating unit 2012, the inverse FFT2010 of two dimension and window function processor 2009.
Data producer 2015, based on the variance yields σ x inputted according to the count value of main sweep counter 2005 and σ y and covariance value ρ xy, produces the dimensional Gaussian distributed data of the exposure distribution of the laser in when object pixel is exposed, centered by object pixel photosensitive drums.That is, data producer 2015 produces each position of main scanning direction or the dimensional Gaussian distributed data in often multiple pieces (regions) based on the variance yields of input.The dimensional Gaussian distributed data of generation is input to Two-dimensional FFT 2013 by generator 2015.Two-dimensional FFT is by performing to the dimensional Gaussian distributed data inputted from data producer 2015 performance data that fast fourier transform produces spatial frequency.The performance data (profile) obtained by conversion is input to arithmetic element 2011 by Two-dimensional FFT.
Fig. 7 (a), Fig. 7 (b) and Fig. 7 (c) are the examples of the performance data being input to arithmetic element 2011 by Two-dimensional FFT 2013.In Fig. 7 (a), Fig. 7 (b) and Fig. 7 (c), each axle represents angular frequency, and pel spacing is from corresponding with 0.1.Fig. 7 (a), Fig. 7 (b) and Fig. 7 (c) pass through each position (L2 in the photosensitive drums of the main scanning direction shown in Figure 21, C, R2) place the arithmetical operation to spatial frequency of dimensional Gaussian distributed data in carry out characterization data.Fig. 7 (a) illustrates the performance data (DATA_L) of the exposure distribution in the end regions (L2) that the scanning of main scanning direction starts in the photosensitive drums of side.Fig. 7 (b) illustrates the performance data (DATA_C) of the exposure distribution in the central area (C) in the photosensitive drums of main scanning direction.Fig. 7 (c) illustrates the performance data (DATA_R) of the exposure distribution in the end regions (R2) in the photosensitive drums of the end of scan side of main scanning direction.
ROM2014 stores the datum characteristic data (target characteristic data) of exposure distribution.In the image forming apparatus of the present embodiment, the exposure distribution in the central area (C) of the photosensitive drums of main scanning direction is assumed that ideal exposure distributes.Thus, DATA_C is stored in ROM2014.Between image Formation period, DATA_C is independently outputted to arithmetic element 2011 by the count value of ROM2014 and main sweep counter 2005.
Arithmetic element 2011 produces differential data based on the performance data inputted from Two-dimensional FFT 2013 with from the datum characteristic data of ROM2014 input.DATA_L-C shown in Fig. 8 (a) is by deducting the differential data obtained from the DATA_C of ROM2014 input from the DATA_L inputted from Two-dimensional FFT 2013.DATA_R-C shown in Fig. 8 (b) is by deducting the differential data obtained from the DATA_C of ROM2014 input from the DATA_R inputted from Two-dimensional FFT 2013.That is, DATA_L-C and DATA_R-C is the data of instruction relative to the difference of the exposure distribution in each scanning area of the exposure distribution as target.DATA_L-C and DATA_R-C represents, in the exposure distribution that the scanning of main scanning direction starts in the exposure distribution in the end regions (L2) of side and the end regions (R2) in the end of scan side of main scanning direction, compared with the exposure distribution of the central area (C) of main scanning direction, the high range property at the oblique part place of the short side direction of oval exposure distribution rises, and the high range property at longitudinal oblique part place declines.Because the exposure distribution of the central part office of photosensitive drums is used as desirable exposure distribution, therefore, DATA_C-C (not shown) is not concavo-convex.
Then, arithmetic element 2011 produces correction data based on the DATA_L-C in Fig. 8 (a).That is, arithmetic element 2011 produces correction data, to reduce the difference between DATA_L and DATA_C that represented by DATA_L-C.Similarly, arithmetic element 2011 produces correction data based on the DATA_R-C in Fig. 8 (b).That is, arithmetic element 2011 produces correction data, to reduce the difference between DATA_R and DATA_C that represented by DATA_R-C.
When Ft (ω x, ω y) be the spatial frequency characteristic of calibration object and Fr (ω x, ω y) is the spatial frequency characteristic of benchmark time, carry out arithmetical operation correction data K (ω x, ω y) by using following functional expression.
K (ω x, ω y)=Fr (ω x, ω y)/Ft (ω x, ω y) ... expression formula 2
Correcting range designating unit 2012 is specified and is kept having the spatial frequency of little calibration result, and, specified scope is fixed the scope that (clip) is predetermined value.In the present embodiment, spatial frequency is fixed on 0.Fig. 9 illustrate fixing by correcting range designating unit 2012 and export from arithmetic element 2011, the example of correction data that produces based on the operational data Fig. 8 (a).The correction data obtained by arithmetical operation (Fig. 9) is input to the inverse FFT of two dimension by arithmetic element 2011.
Two-dimentional inverse FFT2010 performs frequency inverse conversion to the correction data inputted from arithmetic element 2011, and produces correction parameter (filter factor) corresponding with the surrounding pixel surrounding object pixel with object pixel respectively.Figure 10 illustrates in the matrix form by the inverse FFT2010 generation of two dimension and correction parameter corresponding with object pixel and surrounding pixel respectively.Character k (x, y) represents filter factor.The filter factor of object pixel is k (0,0).The filter factor of the matrix form shown in Figure 10 represents the variable quantity of the electromotive force by the surrounding pixel be positioned at around object pixel being exposed to the target pixel location place that laser causes.As the example correcting the characteristic distributed about the point symmetry of object pixel, describe according to the exposure distribution in the image forming apparatus of the present embodiment.Thus, filter factor k (x, y) is also about object pixel point symmetry.The inverse FFT2010 of two dimension inputs each filter factor k (x, y) to window function processor 2009.
Window function processor 2009 exports by correcting the filter factor kw (x, y) obtained from the filter factor k (x, y) of the inverse FFT2010 input of two dimension with the window function w (x, y) of earlier set.In the present embodiment, Hamming (Hamming) window is set to window function w (x, y).
Kw (x, y)=w (x, y) * k (x, y) ... expression formula 3
Filter factor generator 2004 performs above-mentioned process to each pixel, and, in two dimensional filter 2002 to each pixel based on the filter factor image correcting data as correction data exported from window function processor 2009.Therefore, even if exposure distribution is different along main scanning direction, the unevenness along main scanning direction of exposure intensity distribution (Potential Distributing of electrostatic latent image) that photosensitive drums is formed also can be limited.
Below, the inside configuration of two dimensional filter 2002 is described with reference to Figure 11.Two dimensional filter comprises FIFO (pushup storage) 5001 ~ 5014, shift register cell 5015, multiplier 5016 and totalizer 5017.
As shown in figure 11, be connected in series in 14 FIFO5001 ~ 5014, synchronously receives the input of view data from LUT2001 with image clock, and, synchronously by input order, view data is outputted to shift register cell 5003 with image clock.FIFO5001 ~ 5014 of the present embodiment are used as to scan according to single the linear memory impact damper that pixel count corresponding to period (single sweep trace) stores view data.
Shift register cell 5003 comprises 15 × 15 registers.Multiple register D0_0 ~ D14_0 is assigned to the shift register in the first order.Configure the shift register group in the second to the ten Pyatyi similarly.That is, shift register cell 5003 comprises the Parasites Fauna of 15 levels.FIFO memory 5001 in the first order is connected with the register D0_0 in the shift register in the first order, and, according to input order, the view data (pixel data) corresponding with single pixel is input to register D0_0.Second and later level in FIFO memory connect with the most upstream register in corresponding shift register respectively, and according to input order, view data (pixel data) corresponding with single pixel is respectively input to most upstream register.
In addition, LUT2001 is connected with the register 14_0 in the shift register in the tenth Pyatyi.That is, the view data corresponding with single pixel is input to the register D14_0 in the FIFO5014 in the tenth level Four and the shift register in the tenth Pyatyi by LUT2001.Object pixel is the data of the register D7_7 that will be input in shift register cell 5015.
Multiplier unit 5004 comprises 15 × 15 multiplier M0_14 ~ M14_14.With the register that relation is respectively in shift register cell 5015 one to one, each multiplier is set individually.Multiplier receives the input of view data corresponding with single pixel respectively from the register of correspondence.Each multiplier receives the input of the filter factor exported from the window function processor 2009 of filter factor generator 2004.View data is multiplied by the filter factor of input by each multiplier.Then, the view data after being multiplied is outputted to adder unit 3017 by each multiplier.
Adder unit comprises totalizer Ax (X:0 ~ 14) and totalizer A_ALL.Totalizer Ax performs addition to the view data corresponding with single pixel exported from each in multiplier M0_x ~ M14_x.Totalizer A_ALL performs addition to the output from totalizer Ax, and, result is outputted to LUT2003 as the view data of object pixel.
By this way, the filter factor of surrounding pixel is utilized to correct the pixel data corresponding with object pixel by two dimensional filter 2002, even if the exposure distribution of the laser centered by object pixel is different according to the exposure area (or exposure position) of the main scanning direction in photosensitive drums, the Potential Distributing of the electrostatic latent image centered by object pixel also can be prevented uneven.Such as, as shown in Figure 12 (b), no matter screen angle (or orientation of fine rule) how, and the unevenness of the picture quality of the output image of the main scanning direction shown in Figure 21 all can be limited.
Second embodiment
In the present embodiment, describe the configuration of image correcting data, this configuration is different from the second embodiment.Configuration beyond exposure modulator is identical, therefore, omits the description of the configuration beyond for exposure modulator.
Figure 13 illustrates the control block diagram of the image forming apparatus according to the present embodiment.ROM1303 stores the filter factor corresponding with each position (or each region) of main scanning direction.Filter factor is the filter factor in the matrix centered by object pixel, and, corresponding with object pixel and surrounding pixel respectively.Based on the count value of main sweep counter 2005, data-reading unit 1302 from the filter factor corresponding with each position of main scanning direction ROM1303 sensor matrix, and, writing filtering coefficient in the register in two dimensional filter 1301.Two dimensional filter 1301 performs calculation process according to matrix coefficient to the view data of object pixel, and, produce the view data of each pixel.
Below, the calculation process performed by two dimensional filter 1301 is described.Two dimensional filter 1301 comprises the first arithmetic processor 1304 and the second arithmetic processor 1305.
First the first calculation process performed by the first arithmetic processor 1304 is described.By changing the weighting of the exposure of object pixel and surrounding pixel thereof according to the spot shape of target location, no matter the difference of the spot shape of the position of main scanning direction how, all prevents the exposure distribution of the view data of based target pixel uneven.As shown in the figure, the first arithmetic processor 1301 obtains matrix coefficient M (a)={ M (a)
11, M (a)
12, M (a)
13, M (a)
21, M (a)
22, M (a)
23, M (a)
31, M (a)
32, M (a)
33and the first operation result { a of being obtained by concentration data I (a) of integral target pixel a
11, a
12, a
13, a
21, a
22, a
23, a
31, a
32, a
33.The operation expression of the first calculation process performed by the first arithmetic processor is below provided.
First operation result=I (a) × M (a)={ I (a) × M (a)
11, I (a) × M (a)
12, I (a) × M (a)
13, I (a) × M (a)
21, I (a) × M (a)
22, I (a) × M (a)
23, I (a) × M (a)
31, I (a) × M (a)
32, I (a) × M (a)
33... expression formula 4
Figure 14 calculation process is shown after the operation result for pixel a.Such as, as shown in Figure 21 (b), for the spot shape of laser from the such position of the end regions (L2) of main scanning direction elongated left to bottom right, filter factor is set with image correcting data, make, carrying out with not utilizing filter factor compared with situation about correcting, increasing relative to the exposure of the lower-left of object pixel and the surrounding pixel of upper right.On the contrary, for the position that the end regions (R2) of the main scanning direction elongated from lower-left to upper right of the spot shape of laser is such, filter factor is set with image correcting data, make, carry out compared with situation about correcting with not utilizing filter factor, the exposure of the surrounding pixel of upper left and bottom right increases.It should be noted that as shown in figure 14, all pixels for handling object image perform the first calculation process.
Matrix coefficient used herein is designed in advance, such as, is designed, and is stored in ROM1303 when factory adjusts.Figure 16 (a) illustrates the example of the filter factor in the matrix be stored in ROM1303.When loading and transporting from factory, CCD is arranged in the position corresponding with the surface of photosensitive drums, or multiple positions (longitudinal direction) of main scanning direction (longitudinal direction of photosensitive drums) are arranged in the n that counts (n is natural number), further, in the spot shape of multiple position measurement laser.Then, the matrix coefficient { M (pi) corresponding with the measurement result at measuring position pi (i is the integer of the 1 ~ n) place of main scanning direction is calculated
11, M (pi)
12, M (pi)
13, M (pi)
21, M (pi)
22, M (pi)
23, M (pi)
31, M (pi)
32, M (pi)
33, and matrix coefficient and measuring position Pi are stored in storer 1303 explicitly.Filter factor representative shown in Figure 16 is exposed the variable quantity of the electromotive force of the pixel position of the surrounding pixel around the object pixel that causes by object pixel.It should be noted that measuring position pi is the value corresponding with the count value of main sweep counter.
In the first calculation process, select the matrix coefficient corresponding with the lengthwise position of object pixel, and, perform Integral Processing about concentration data.In this case, according to the present embodiment, when performing computing by use 3 × 3 matrix coefficient, matrix size is determined, to obtain effect to resolution and spot size.Figure 16 (b) and Figure 16 (c) illustrates the relation between resolution (pixel separation) and spot size respectively.If spot size as shown in Figure 16 (b) comparatively large about pixel separation, so multiple spot is overlapped.In this case, by increasing matrix size and performing computing to the pixel comprising neighbor and the and then pixel of neighbor, can to the change of shape correction light quantity distribution of more blotch.In addition, overlapped iff the spot in the pixel adjacent with object pixel, the spot in the pixel of so and then neighbor does not affect the light quantity distribution of object pixel.Thus, 3 × 3 matrix coefficients are used.As shown in Figure 16 (b), if spot size is substantially equal to pixel separation, even if so the light quantity of neighbor is adjusted, this adjustment also less affects the light quantity distribution of object pixel.Thus, in the present embodiment, the effect of this technology is less.In addition, if increase matrix size, storer is so needed to store the concentration data of the surrounding pixel for computing.Operand increases, and therefore, circuit scale increases.Therefore, wish that matrix size is little, make the correction of light quantity distribution effective.
Below, with reference to Figure 17, the second calculation process performed by the second arithmetic processor 1305 is described.Such as, when pixel e is object pixel, by the first calculation process, as shown in figure 15, the view data e of pixel e is produced
22.In addition, when pixel e is surrounding pixel, view data a is produced to pixel e
33, b
32, c
31, d
23, e
22, f
21, g
13, h
12, i
11.In order to obtain the view data Ex (e) of pixel e, the second arithmetic processor 1305 performs computing as follows as the second calculation process.
Ex (e)=a
33+ b
32+ c
31+ d
23+ e
22+ f
21+ g
13+ h
12+ i
11... expression formula 5
Second arithmetic processor 1305 is to the second calculation process in all pixel executable expressions 5.By the second calculation process, LUT2003 is imported into the view data that all pixels obtain.
By switching filter factor according to the exposure position of main scanning direction and correcting the view data of surrounding pixel, even if the spot shape of the laser in the photosensitive drums of main scanning direction is unbalanced, the unevenness of the exposure distribution of main scanning direction also can be limited.
Realize obtaining the configuration with the result of above-mentioned exposure setting process equivalence by filtering process.Filtering process is also included within scope of the present invention.Describe filtering process in detail.When calculate the expression formula 5 of second operation result Ex (e) of pixel e is out of shape time, obtain following formula.
Ex (e)=a
33+ b
32+ c
31+ d
23+ e
22+ f
21+ g
13+ h
12+ i
11=I (a) × M (a)
33+ I (b) × M (b)
32+ I (c) × M (c)
31+ I (d) × M (d)
23+ I (e) × M (e)
22+ I (f) × M (f)
21+ I (g) × M (g)
13+ I (h) × M (h)
12+ I (i) × M (i)
11... expression formula 6
This uses wave filter { M (a)
33, M (b)
32, M (c)
31, M (d)
23, M (e)
22, M (f)
21, M (g)
13, M (h)
12, M (i)
11filtering process, and, calculate concentration data { I (a), I (b), the I (c) of object pixel and surrounding pixel, I (d), I (e), I (f), I (g), I (h), I (i) } linear and.
In addition, in the present embodiment, LED pulse width and fluorescent lifetime by changing laser control exposure; But, be not limited thereto.Again such as, light quantity and luminous intensity by changing laser control exposure (this also can be applicable to the first embodiment).
In addition, in the present embodiment, by the shape correction comprising the synthesis light quantity distribution at one group of pixel place of object pixel and surrounding pixel thereof be wish shape be process object; But the object of process is not limited thereto.Again such as, the object of process can be the position that the centre of gravity place of the synthesis light quantity distribution at one group of pixel place by comprising object pixel and surrounding pixel thereof is corrected to hope.Therefore, the unevenness of the picture quality that may occur when the side-play amount of image space is different according to lengthwise position.
3rd embodiment
Similar with the second embodiment, the present embodiment spot shape related to based on the multiple lengthwise position places measured in advance sets the technology of the exposure of each pixel.Especially, the point different from the second embodiment is described in detail.
In the present embodiment, when spot shape changes with the temperature variation in equipment, suitable correction is carried out according to temperature.The parts forming optical scanner 101,102,103 and 104 expand due to temperature variation (or contraction).Then, until the optical path length that laser arrives the surface of photosensitive drums changes, and there will be and defocus.Now, as shown in figure 18, spot shape changes according to scattered quantum.When defocusing increase, the light intensity at spot centers place reduces, and meanwhile, the light intensity in peripheral part increases.Thus, spot shape broadens and defocuses.In order to correct the change of the spot shape caused due to temperature variation, the matrix coefficient corresponding with spot shape during temperature change is stored in storer, internal temperature is measured by the measuring unit be arranged in equipment, further, corresponding with each lengthwise position according to temperature variation setting matrix coefficient.Figure 19 illustrates the block diagram comprising the configuration of thermal resistor 1903 in equipment.Thermal resistor 1903 detects internal temperature.Internal temperature when controller 1901 monitoring picture is formed.If temperature becomes predetermined value, the matrix coefficient that so setting is corresponding with temperature on the basis of laser.
The operation of controller 1903 is described.Similar with the second embodiment, assuming that immediately writing initial matrix coefficient after a power up in the register of the first arithmetic element 1304 shown in Figure 13 (b).And working continuously period, internal temperature is repeated to monitor, if there is to a certain degree or greatly temperature variation, so the matrix coefficient write in register is updated.The operation of the controller of period of working continuously shown in Figure 20.In step 1, when indicating print job to start, controller 1901 starts to monitor temperature.Controller 1901 monitors the output from thermal resistor 1903 in step 2, determines whether the temperature variation risen since supervision before exceedes predetermined threshold value in step 3.In step 3, if determine that temperature variation is no more than predetermined threshold, so controller 1901 monitors internal temperature control being moved on in step 2 after predetermined time interval.If determine that temperature variation exceedes predetermined threshold in step 3, so controller 1901 starts the filter factor that sets in matrix in step 4.In steps of 5, controller 1901 is based on the count value determination lengthwise position of main sweep counter.In step 6, controller 1901 reads based on the matrix coefficient of the determination result step 5 from storer.The address corresponding with each position of each main scanning direction is assigned to ROM1303, and, store the filter factor in the matrix corresponding with internal temperature explicitly with address.Controller 1901 reads the filter factor in the matrix corresponding with lengthwise position and the temperature that detected by thermal resistor 1901 in step 6, and, write the filter factor in the matrix of reading in step 7 in a register.In step 8, controller 1901 determines whether to terminate the setting for all lengthwise positions.If determine that setting terminates, so control to proceed to step 9.In step 9, controller 1901 determines whether operation terminates.If operation does not terminate (operation continuation), so control to move on in step 2 to monitor internal temperature.If determine the end of job in step 8, so controller 1901 terminates the setting operation for the filter factor in matrix.
In the present embodiment, similar with the second embodiment, the filter factor in matrix is stored in ROM1301 according to the spot shape at each lengthwise position place measured in advance when adjusting in the factory.In addition, the change about internal temperature change of spot is measured in advance, joins the filter factor in ground storage matrix with temperature correlation.Compared with the first and second embodiments, except the change of the spot shape at the lengthwise position place at initial stage, according to the image forming apparatus of the 3rd embodiment also recoverable change the change of the spot shape caused due to internal temperature.
In the present embodiment, according to the filter factor in the testing result setting matrix of internal temperature.But detected object is not limited to internal temperature.Such as, interior humidity or interior atmospheric pressure is measured by measuring unit 1902.Again such as, the position of any one, posture, speed, temperature, resistance, carried charge, drive current, driving timing etc. in the parts of composing images forming device can be detected objects.
The invention is not restricted to the embodiments described, and, when not deviating from the spirit and scope of the present invention, variations and modifications can be proposed.Therefore, claims are for the protection of scope of the present invention.
This application claims the rights and interests of the Japanese patent application No.2013-087877 submitted on April 18th, 2013, by reference its full content is incorporated to herein at this.
Claims (8)
1. an image forming apparatus, is characterized in that, comprising:
Light source, is configured to launch the light beam for being exposed by photosensitive-member;
Inflector assembly, makes beam flying photosensitive-member for deflected beam;
Optical devices, for being directed to photosensitive-member by the light beam deflected by inflector assembly;
Data generating apparatus, for generation of the pixel data corresponding with each pixel comprised in the output image;
Output unit, for exporting for correcting by making photosensitive-member be exposed to light beam and the correction data of the unevenness of the Potential Distributing of the electrostatic latent image centered by object pixel formed on photosensitive-member along the direction of scanning of beam flying photosensitive-member, described correction data is corresponding with the position of the object pixel on direction of scanning, and output unit exports the correction data of instruction owing to making the surrounding pixel be positioned at around object pixel be exposed to the potential change amount of the position of the object pixel that light beam causes;
Means for correcting, for the pixel data of the pixel data correction target pixel based on correction data and object pixel; And
Control device, for controlling light source to form object pixel based on the pixel data of the object pixel by correction.
2. image forming apparatus according to claim 1, wherein, output unit comprises the memory storage for storing the correction data corresponding with the position on direction of scanning.
3. image forming apparatus according to claim 1, also comprises:
For storing the memory storage of third party's difference of the Potential Distributing of the electrostatic latent image centered by object pixel in the first party difference of the Potential Distributing of the electrostatic latent image centered by object pixel on beacon scanning direction, the second party difference indicating the Potential Distributing of the electrostatic latent image centered by object pixel in the sense of rotation of photosensitive-member and direction of scanning and sense of rotation; With
Correction data generation device, for producing correction data based on first party difference, second party difference and third party's difference.
4. the image forming apparatus according to any one in claims 1 to 3, wherein, described correction data comprises the correction parameter for object pixel and the correction parameter for multiple surrounding pixels of surrounding object pixel.
5. an image forming apparatus, is characterized in that, comprising:
Light source, is configured to launch the light beam for being exposed by photosensitive-member;
Inflector assembly, makes beam flying photosensitive-member for deflected beam;
Optical devices, for being directed to photosensitive-member by the light beam deflected by inflector assembly;
Data generating apparatus, for generation of the pixel data corresponding with each pixel comprised in the output image;
Output unit, for exporting the correction data of the unevenness of the Potential Distributing for correcting the electrostatic latent image centered by object pixel formed on photosensitive-member by making photosensitive-member be exposed to light beam along the direction of scanning of beam flying photosensitive-member, described correction data instruction is exposed to the potential change amount of the pixel position of the surrounding pixel around the object pixel that light beam causes due to object pixel;
Means for correcting, for the pixel data of correction target pixel and the pixel data of object pixel that corrects based on correction data; And
Control device, for controlling light source to form object pixel based on the pixel data by correction.
6. image forming apparatus according to claim 5, wherein, output unit comprises the memory storage for storing the correction data corresponding with the position on direction of scanning.
7. the image forming apparatus according to claim 5 or 6, wherein, correction data is the two-dimensional filtering comprising the correction parameter corresponding with object pixel and the correction parameter corresponding with surrounding pixel, and means for correcting carrys out image correcting data based on the two-dimensional filtering exported from output unit according to the position of the object pixel on direction of scanning.
8. the image forming apparatus according to any one in claim 1 ~ 7, also comprises:
Synchronization signal generation apparatus, for receiving the light beam that deflected by inflector assembly and reception in response to light beam produces synchronizing signal;
Clock signal generating apparatus, for generation of the clock signal as the frequency signal higher than the frequency of synchronizing signal; And
Counter, is configured to counting clock signal,
Wherein, the count value of counter is the value corresponding with the position on direction of scanning, and
Wherein, output unit exports the correction data corresponding with count value based on the count value of counter.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-087877 | 2013-04-18 | ||
| JP2013087877A JP6120655B2 (en) | 2013-04-18 | 2013-04-18 | Image forming apparatus |
| PCT/JP2014/058853 WO2014171286A1 (en) | 2013-04-18 | 2014-03-27 | Image formation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105164588A true CN105164588A (en) | 2015-12-16 |
| CN105164588B CN105164588B (en) | 2018-06-22 |
Family
ID=51731238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480021638.1A Active CN105164588B (en) | 2013-04-18 | 2014-03-27 | Image forming apparatus |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US9703230B2 (en) |
| EP (1) | EP2988174B1 (en) |
| JP (1) | JP6120655B2 (en) |
| KR (1) | KR20150142022A (en) |
| CN (1) | CN105164588B (en) |
| WO (1) | WO2014171286A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579947A (en) * | 2018-06-07 | 2019-12-17 | 佳能株式会社 | Power supply device and image forming apparatus |
| CN108781265B (en) * | 2016-03-30 | 2020-11-03 | 株式会社尼康 | Feature extraction element, feature extraction system, and determination device |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8497972B2 (en) | 2009-11-13 | 2013-07-30 | Manufacturing Resources International, Inc. | Thermal plate with optional cooling loop in electronic display |
| US8654302B2 (en) | 2008-03-03 | 2014-02-18 | Manufacturing Resources International, Inc. | Heat exchanger for an electronic display |
| US10827656B2 (en) | 2008-12-18 | 2020-11-03 | Manufacturing Resources International, Inc. | System for cooling an electronic image assembly with circulating gas and ambient gas |
| KR101894027B1 (en) | 2013-07-08 | 2018-08-31 | 매뉴팩처링 리소시스 인터내셔널 인코포레이티드 | Figure eight closed loop cooling system for electronic display |
| JP6300611B2 (en) * | 2014-04-04 | 2018-03-28 | キヤノン株式会社 | Image forming apparatus and image forming method |
| JP6296868B2 (en) * | 2014-04-08 | 2018-03-20 | キヤノン株式会社 | Image forming apparatus |
| KR101885884B1 (en) | 2014-04-30 | 2018-08-07 | 매뉴팩처링 리소시스 인터내셔널 인코포레이티드 | Back to back electronic display assembly |
| US9723765B2 (en) | 2015-02-17 | 2017-08-01 | Manufacturing Resources International, Inc. | Perimeter ventilation system for electronic display |
| KR102104342B1 (en) | 2016-03-04 | 2020-04-24 | 매뉴팩처링 리소시스 인터내셔널 인코포레이티드 | Cooling system for double-sided display assembly |
| US10485113B2 (en) | 2017-04-27 | 2019-11-19 | Manufacturing Resources International, Inc. | Field serviceable and replaceable display |
| WO2018200905A1 (en) | 2017-04-27 | 2018-11-01 | Manufacturing Resources International, Inc. | System and method for preventing display bowing |
| US10036975B1 (en) * | 2017-06-28 | 2018-07-31 | Eastman Kodak Company | Determining a pulse timing function for a linear printhead |
| US10559965B2 (en) | 2017-09-21 | 2020-02-11 | Manufacturing Resources International, Inc. | Display assembly having multiple charging ports |
| JP7106363B2 (en) * | 2018-06-18 | 2022-07-26 | キヤノン株式会社 | image forming device |
| JP2020008769A (en) * | 2018-07-10 | 2020-01-16 | 東芝テック株式会社 | Image forming apparatus |
| US10602626B2 (en) | 2018-07-30 | 2020-03-24 | Manufacturing Resources International, Inc. | Housing assembly for an integrated display unit |
| US11096317B2 (en) | 2019-02-26 | 2021-08-17 | Manufacturing Resources International, Inc. | Display assembly with loopback cooling |
| US10795413B1 (en) | 2019-04-03 | 2020-10-06 | Manufacturing Resources International, Inc. | Electronic display assembly with a channel for ambient air in an access panel |
| US11477923B2 (en) | 2020-10-02 | 2022-10-18 | Manufacturing Resources International, Inc. | Field customizable airflow system for a communications box |
| US11778757B2 (en) | 2020-10-23 | 2023-10-03 | Manufacturing Resources International, Inc. | Display assemblies incorporating electric vehicle charging equipment |
| US11470749B2 (en) | 2020-10-23 | 2022-10-11 | Manufacturing Resources International, Inc. | Forced air cooling for display assemblies using centrifugal fans |
| US11966263B2 (en) | 2021-07-28 | 2024-04-23 | Manufacturing Resources International, Inc. | Display assemblies for providing compressive forces at electronic display layers |
| US11762231B2 (en) | 2021-08-23 | 2023-09-19 | Manufacturing Resources International, Inc. | Display assemblies inducing turbulent flow |
| US11744054B2 (en) | 2021-08-23 | 2023-08-29 | Manufacturing Resources International, Inc. | Fan unit for providing improved airflow within display assemblies |
| US11919393B2 (en) | 2021-08-23 | 2024-03-05 | Manufacturing Resources International, Inc. | Display assemblies inducing relatively turbulent flow and integrating electric vehicle charging equipment |
| US11968813B2 (en) | 2021-11-23 | 2024-04-23 | Manufacturing Resources International, Inc. | Display assembly with divided interior space |
| US12010813B2 (en) | 2022-07-22 | 2024-06-11 | Manufacturing Resources International, Inc. | Self-contained electronic display assembly, mounting structure and methods for the same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000198233A (en) * | 1999-01-08 | 2000-07-18 | Fujitsu Ltd | Apparatus and method for electrophotography |
| JP2005297252A (en) * | 2004-04-07 | 2005-10-27 | Ricoh Co Ltd | Image forming apparatus and image formation method |
| CN1696761A (en) * | 2004-03-02 | 2005-11-16 | 精工爱普生株式会社 | Image forming apparatus |
| US20080225905A1 (en) * | 2007-03-13 | 2008-09-18 | Kabushiki Kaisha Toshiba | Apparatus, method and program for image forming |
| CN101311839A (en) * | 2007-05-21 | 2008-11-26 | 佳能株式会社 | Image forming apparatus |
| CN102629091A (en) * | 2011-02-01 | 2012-08-08 | 柯尼卡美能达商用科技株式会社 | Image forming apparatus |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4313062B2 (en) * | 2003-02-28 | 2009-08-12 | 株式会社沖データ | Image forming apparatus and image forming method |
| JP2005001201A (en) * | 2003-06-11 | 2005-01-06 | Murata Mach Ltd | Image formation device and image formation method |
| JP2005140922A (en) | 2003-11-05 | 2005-06-02 | Ricoh Co Ltd | Optical scanner, image forming apparatus and correcting method for deviation of position |
| JP4341908B2 (en) * | 2004-01-07 | 2009-10-14 | 株式会社リコー | Pixel clock and pulse modulation signal generation apparatus, optical scanning apparatus, and image forming apparatus |
| US20080292333A1 (en) * | 2007-05-21 | 2008-11-27 | Canon Kabushiki Kaisha | Image forming apparatus |
| JP2010005825A (en) * | 2008-06-24 | 2010-01-14 | Canon Inc | Image forming apparatus and image forming method |
| JP5404321B2 (en) | 2008-11-05 | 2014-01-29 | キヤノン株式会社 | Image forming apparatus |
| US8947740B1 (en) * | 2014-02-17 | 2015-02-03 | Xerox Corporation | Method and apparatus for adjusting light intensity based on content to achieve a uniform exposure |
-
2013
- 2013-04-18 JP JP2013087877A patent/JP6120655B2/en active Active
-
2014
- 2014-03-27 WO PCT/JP2014/058853 patent/WO2014171286A1/en active Application Filing
- 2014-03-27 EP EP14785542.3A patent/EP2988174B1/en active Active
- 2014-03-27 US US14/785,290 patent/US9703230B2/en active Active
- 2014-03-27 CN CN201480021638.1A patent/CN105164588B/en active Active
- 2014-03-27 KR KR1020157032168A patent/KR20150142022A/en not_active Application Discontinuation
-
2017
- 2017-06-15 US US15/624,379 patent/US9964888B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000198233A (en) * | 1999-01-08 | 2000-07-18 | Fujitsu Ltd | Apparatus and method for electrophotography |
| CN1696761A (en) * | 2004-03-02 | 2005-11-16 | 精工爱普生株式会社 | Image forming apparatus |
| JP2005297252A (en) * | 2004-04-07 | 2005-10-27 | Ricoh Co Ltd | Image forming apparatus and image formation method |
| US20080225905A1 (en) * | 2007-03-13 | 2008-09-18 | Kabushiki Kaisha Toshiba | Apparatus, method and program for image forming |
| CN101311839A (en) * | 2007-05-21 | 2008-11-26 | 佳能株式会社 | Image forming apparatus |
| CN102629091A (en) * | 2011-02-01 | 2012-08-08 | 柯尼卡美能达商用科技株式会社 | Image forming apparatus |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108781265B (en) * | 2016-03-30 | 2020-11-03 | 株式会社尼康 | Feature extraction element, feature extraction system, and determination device |
| CN110579947A (en) * | 2018-06-07 | 2019-12-17 | 佳能株式会社 | Power supply device and image forming apparatus |
| CN110579947B (en) * | 2018-06-07 | 2022-10-18 | 佳能株式会社 | Power supply device and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2988174B1 (en) | 2021-05-19 |
| WO2014171286A1 (en) | 2014-10-23 |
| US20170285511A1 (en) | 2017-10-05 |
| US9964888B2 (en) | 2018-05-08 |
| CN105164588B (en) | 2018-06-22 |
| JP6120655B2 (en) | 2017-04-26 |
| KR20150142022A (en) | 2015-12-21 |
| US20160085172A1 (en) | 2016-03-24 |
| EP2988174A1 (en) | 2016-02-24 |
| JP2014210380A (en) | 2014-11-13 |
| US9703230B2 (en) | 2017-07-11 |
| EP2988174A4 (en) | 2016-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105164588A (en) | Image formation device | |
| JP6624881B2 (en) | Image forming apparatus and control method thereof | |
| US8570594B2 (en) | Image forming apparatus and its control method of correction amount based on selected rotational speed | |
| US20070057989A1 (en) | Image forming apparatus and control method thereof | |
| US8786907B2 (en) | Image processing apparatus, control method of image processing apparatus, image forming apparatus, and storage medium | |
| US20160018774A1 (en) | Image formation apparatus and image formation method | |
| JP5424820B2 (en) | Image forming apparatus, image forming method, and program | |
| JP5171165B2 (en) | Image forming apparatus | |
| JP5593168B2 (en) | Image forming apparatus and toner consumption calculation method | |
| US11048187B1 (en) | Exposure control device, image forming apparatus, and non-transitory computer readable medium | |
| CN110007573B (en) | Image forming apparatus and position correction method | |
| JP2012022208A (en) | Image processing device, image forming apparatus, and image processing program | |
| JP2007286509A (en) | Image forming apparatus | |
| JP6136391B2 (en) | Image processing apparatus, image forming apparatus, image correction method, and program | |
| US7729021B2 (en) | Image processing apparatus and method thereof, and image forming apparatus using the image processiing apparatus | |
| JP6914739B2 (en) | Image forming device, image forming method, and program | |
| JP2017129689A (en) | Image formation apparatus, gradation correction apparatus, gradation correction program, and gradation correction method | |
| JP2008068509A (en) | Image forming device and luminous energy control method | |
| US20110044712A1 (en) | Image forming apparatus | |
| JP6611503B2 (en) | Image processing apparatus, image processing method, and program | |
| JP2024088440A (en) | Color image forming device | |
| JP2014068084A (en) | Image forming apparatus | |
| JP6221916B2 (en) | Image forming apparatus and exposure control method | |
| JP2019130723A (en) | Color image formation apparatus | |
| JP2019120767A (en) | Color image forming apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |